X-ray Emission from Wind Blown Bubbles. III. ASCA SIS Observations of NGC6888

Details X-ray Emission from Wind Blown Bubbles. III. ASCA SIS Observations of NGC6888 X-ray Emission from Wind Blown Bubbles. III. ASCA SIS Observations of NGC6888

2005-07-17

arxiv.org/abs/astro-ph/0507391v1

Astrophys.J.633:248-256,2005

Astronomy and Astrophysics

Astrophysics

24 pages, 6 figures; accepted for Astrophysical Journal, Nov 1, 2005 issue

Scientific paper

10.1086/444530

We present ASCA SIS observations of the wind-blown bubble NGC6888. Owing to the higher sensitivity of the SIS for higher energy photons compared to the ROSAT PSPC, we are able to detect a T ~ 8x10^6 K plasma component in addition to the T ~ 1.3x10^6 K component previously detected in PSPC observations. No significant temperature variations are detected within NGC6888. Garcia-Segura & Mac Low's (1995) analytical models of WR bubbles constrained by the observed size, expansion velocity, and mass of the nebular shell under-predict the stellar wind luminosity, and cannot reproduce simultaneously the observed X-ray luminosity, spectrum, surface brightness profile, and SIS count rate of NGC6888's bubble interior. The agreement between observations and expectations from models can be improved if one or more of the following ad hoc assumptions are made: (1) the stellar wind luminosity was weaker in the past, (2) the bubble is at a special evolutionary stage and the nebular shell has recently been decelerated to 1/2 of its previous expansion velocity, and (3) the heat conduction between the hot interior and the cool nebular shell is suppressed. Chandra and XMM-Newton observations with high spatial resolution and high sensitivity are needed to determine accurately the physical conditions NGC6888's interior hot gas for critical comparisons with bubble models.

Affiliated with

Also associated with

No associations

Rating

X-ray Emission from Wind Blown Bubbles. III. ASCA SIS Observations of NGC6888 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with X-ray Emission from Wind Blown Bubbles. III. ASCA SIS Observations of NGC6888, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and X-ray Emission from Wind Blown Bubbles. III. ASCA SIS Observations of NGC6888 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-396631